下载安装scala：
scala-2.13.1.tgz
解压：
[hadoop@hadoop01 ~]$ tar -zxvf scala-2.13.1.tgz
查看目录：
[hadoop@hadoop01 scala-2.13.1]$ ls -ll
total 16
drwxrwxr-x. 2 hadoop hadoop 162 Sep 18 17:23 bin
drwxrwxr-x. 4 hadoop hadoop 86 Sep 18 17:23 doc
drwxrwxr-x. 2 hadoop hadoop 153 Sep 18 17:23 lib
-rw-rw-r--. 1 hadoop hadoop 11357 Sep 18 17:23 LICENSE
drwxrwxr-x. 3 hadoop hadoop 18 Sep 18 17:23 man
-rw-rw-r--. 1 hadoop hadoop 646 Sep 18 17:23 NOTICE
启动并测试Scala：
scala> println("hello world") hello world scala> 5*9 res1: Int = 45 scala> 2*res1 res4: Int = 90 scala> :help //这里显示了scala命令的使用方法，注意命令前不要少了: All commands can be abbreviated, e.g., :he instead of :help. :completions <string> output completions for the given string :edit <id>|<line> edit history :help [command] print this summary or command-specific help :history [num] show the history (optional num is commands to show) :h? <string> search the history :imports [name name ...] show import history, identifying sources of names :implicits [-v] show the implicits in scope :javap <path|class> disassemble a file or class name :line <id>|<line> place line(s) at the end of history :load <path> interpret lines in a file :paste [-raw] [path] enter paste mode or paste a file :power enable power user mode :quit exit the interpreter :replay [options] reset the repl and replay all previous commands :require <path> add a jar to the classpath :reset [options] reset the repl to its initial state, forgetting all session entries :save <path> save replayable session to a file :sh <command line> run a shell command (result is implicitly => List[String]) :settings <options> update compiler options, if possible; see reset :silent disable/enable automatic printing of results :type [-v] <expr> display the type of an expression without evaluating it :kind [-v] <type> display the kind of a type. see also :help kind :warnings show the suppressed warnings from the most recent line which had any scala> :quit